Is $3,800 to install hybrid closed and open cell spray foam insulation a fair price?
Project Details
The project involves insulating the underside of a shop's roof deck in climate zone 3A to create an unvented, conditioned space. The roof decks are OSB with standing seam metal. The homeowner is debating between a hybrid closed/open cell approach versus an open-cell only approach to prevent condensation and thermal bridging.
Quote Details
Insulate underside of roof deck for a conditioned shop space. - Apply 1-2 inches of closed cell spray foam under the decks for air sealing and moisture control - Cavity fill remaining space with open cell spray foam - Encapsulate 2X6 framing members in closed cell to mitigate thermal bridging - Total coverage area approximately 750 sqft (550 sqft of 2X12 roof and 200 sqft of 2X6 roof) - Target R-value of 35-40
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More Details
Category
Insulation
Price
$3,800
Quote Date
June 15, 2026
Location
Georgia
Insulation Type
Spray foam
R Value
38
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